ztrue

Hi @DevX86, thanks for the feedback and for pointing out this problem; it makes a lot of sense to me. I was not quite sure about adding an extra parameter...

Sorry for not getting back to this issue in time. @fabien-marty, thank you for the link! Overall the change looks right and you are welcome to make a PR. There...

The path suffix `github.com/ztrue/tracerr` is the name of the package. Might be worth changing to just `/tracerr/error_test.go` separately from this change.